
Seatbacks block the aisle behind you, hindering egress. This is the same reason bags must stow fully under the seat in front of you. In an emergency evacuation, seconds mean the difference between life and death. Upright seatbacks and stowed bags save precious seconds.
Cellphones were originally banned for two reasons: to avoid overloading the cell network and for fear of interference with aircraft communication and navigation radios. Interference no longer seems to be a problem; now it’s mostly about avoiding network overload and preventing people from talking on phones.
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